WO2019000360A1 - Filling composition for optical fiber cables - Google Patents
Filling composition for optical fiber cables Download PDFInfo
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- WO2019000360A1 WO2019000360A1 PCT/CN2017/090993 CN2017090993W WO2019000360A1 WO 2019000360 A1 WO2019000360 A1 WO 2019000360A1 CN 2017090993 W CN2017090993 W CN 2017090993W WO 2019000360 A1 WO2019000360 A1 WO 2019000360A1
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- propylene
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
- C08L53/025—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes modified
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/441—Optical cables built up from sub-bundles
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/32—Properties characterising the ingredient of the composition containing low molecular weight liquid component
- C08L2207/322—Liquid component is processing oil
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4483—Injection or filling devices
Definitions
- This disclosure relates to optical fiber cables.
- the disclosure relates to filling compositions for optical fiber cables, while in another aspect, the disclosure relates to optical fiber cables including the same.
- Optical fiber cables include one or more optical fibers or other optical waveguides that conduct optical signals (e.g., for carrying sound, data, video or other information) .
- the optical fibers are arranged in a tubular assembly called a buffer tube.
- the buffer tube is filled with a filling composition which surrounds the optical fibers.
- the filling composition acts as a moisture barrier to prevent water from damaging the optical fibers and a cushion to absorb mechanical shock.
- the filing composition can be a fluid, a gel, a grease or a thixotropic material.
- Buffer tubes are traditionally made of polybutylene terephthalate (PBT) and filling compositions for use with PBT buffer tubes are commonly based on a composition composed of styrenic block copolymer and a large proportion of a hydrocarbon oil (e.g., mineral oil) .
- a filling composition is a fluid which flows easily around the optical fibers to completely fill the buffer tube and can be readily pumped into the buffer tube during manufacture of an optical fiber cable.
- a fluid filling composition is that when the optical fiber cables are cut, the filling composition flows from the cut end which can make installation of the optical fiber cables difficult. Dry gels are easier for operators to work with, in that a cut optical fiber cable having a dry gel for a filling composition does not drip or flow when the optical fiber cable is cut. However, dry gels are difficult to pump and do not flow as readily as fluids.
- Buffer tubes can also be made from a polyolefin material. It is problematic that mineral oil-based filling compositions, such as those used with PBT buffer tubes, have low compatibility with the polyolefin buffer tube material. The mineral oil migrates into the polyolefin material, resulting in loss of mechanical performance for the buffer tube.
- the art recognizes the need for a filling composition which flows (i.e., can be pumped) and reduces or avoids the difficulties associated with oil leakage and cleanup.
- the art further recognizes the need for a filling composition that is compatible with fiber optic cable materials, including the material of the buffer tube.
- the present disclosure provides a filling composition
- a filling composition comprising (A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40°C; (B) a styrene-ethylene/propylene diblock copolymer; and (C) a propylene/ethylene copolymer having a weight average molecular weight (M w ) from 5,000 to 200,000.
- the present disclosure provides a filling composition
- a filling composition comprising (A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40°; (B) a styrene-ethylene/propylene diblock copolymer; and (C) an ethylene/propylene copolymer having a weight average molecular weight (M w ) from 5,000 to 200,000.
- the present disclosure provides a buffer tube comprising a filling composition in contact with a surface of the buffer tube, the composition comprising (A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40°C; (B) a styrene-ethylene/propylene diblock copolymer; and (C) a propylene/ethylene copolymer having a weight average molecular weight (M w ) from 5,000 to 200,000.
- M w weight average molecular weight
- Figure 1 is a cross-sectional view of an optical fiber cable.
- the numerical ranges disclosed herein include all values from, and including, the lower and upper value.
- any subrange between any two explicit values is included (e.g., 1 to 2; 2 to 6; 5 to 7; 3 to 7; 5 to 6; etc. ) .
- all parts and percents are based on weight and all test methods are current as of the filing date of this disclosure.
- Blends are not laminates, but one or more layers of a laminate may contain a blend.
- “Cable” and like terms refer to at least one optical fiber within a protective insulation, jacket or sheath.
- a cable is two or more optical fibers bound together, typically in a common protective insulation, jacket or sheath.
- the individual fibers inside the jacket may be bare, covered or insulated.
- composition includes a mixture of materials which comprise the composition, as well as reaction products and decomposition products formed from the materials of the composition.
- compositions claimed through use of the term “comprising” may include any additional additive, adjuvant, or compound, whether polymeric or otherwise, unless stated to the contrary.
- the term, “consisting essentially of” excludes from the scope of any succeeding recitation any other component, step or procedure, excepting those that are not essential to operability.
- the term “consisting of” excludes any component, step or procedure not specifically listed.
- Density is measured in accordance with ASTM D1525.
- Direct Contact means a configuration whereby a surface is immediately adjacent to a filling composition and no intervening layers or no intervening structures are present between the surface and the filling composition.
- the drop point is an indication of the maximum temperature to which a filling compound can be exposed to without complete liquefaction or excessive oil separation.
- the drop point is determined using a ShenKai Drop Point Tester and is reported in °C.
- the upper cork of the ShenKai Drop Point Tester is positioned so that the tip of the first thermometer bulb is about 3 mm above the bottom of the cup when the apparatus is assembled for test.
- the second thermometer is suspended in the oil bath so that its bulb is at approximately the same level as the bulb of the first thermometer.
- the cup is filled by presenting its larger opening into the filling composition until the cup is filled.
- the cup is held in a vertical position with its smaller opening at the bottom while it is gently pressed down over the metal rod until the rod protrudes about 25 mm above the larger opening.
- the rod is pressed against the cup in such a manner that the rod makes contact with both the upper and lower peripheries of the cup. This contact is maintained while the cup is rotated around its axis and is simultaneously moved down the rod until the cup passes over the lower end of the rod. This spiral-like motion will cause the filling composition to adhere along the rod leaving a conical void of compound in the cup and a coating having reproducible geometry on the inside of the cup.
- the cup and thermometer are placed in the test tube and the test tube is suspended in the oil bath.
- the oil bath is stirred and heated at a rate of 4 °C/min to 7 °C/min until the bath reaches a temperature approximately 17°C below the expected drop point of the filling composition. Heating is continued at a rate such that the difference between the temperature in the test tube and the temperature in the oil bath is maintained between 1-2°C. This condition is established when the oil bath is heated at a rate of about 1 °C/min to 1.5 °C/min. As the temperature increases, the filling composition will gradually protrude through the orifice of the cup. The temperature at which the first drop of material falls is the drop point.
- ethylene-based polymer is a polymer that contains more than 50 weight percent polymerized ethylene monomer (based on the total amount of polymerizable monomers) and, optionally, may contain at least one comonomer.
- Ethylene-based polymer includes ethylene homopolymer, and ethylene copolymer (meaning units derived from ethylene and one or more comonomers) .
- the terms "ethylene-based polymer” and “polyethylene” may be used interchangeably.
- Non-limiting examples of ethylene-based polymer (polyethylene) include low density polyethylene (LDPE) and linear polyethylene.
- Non-limiting examples of linear polyethylene include linear low density polyethylene (LLDPE) , ultra low density polyethylene (ULDPE) , very low density polyethylene (VLDPE) , multi-component ethylene-based copolymer (EPE) , ethylene/ ⁇ -olefin multi-block copolymers (also known as olefin block copolymer (OBC) ) , single-site catalyzed linear low density polyethylene (m-LLDPE) , substantially linear, or linear, plastomers/elastomers, medium density polyethylene (MDPE) , and high density polyethylene (HDPE) .
- LLDPE linear low density polyethylene
- ULDPE ultra low density polyethylene
- VLDPE very low density polyethylene
- EPE multi-component ethylene-based copolymer
- EPE ethylene/ ⁇ -olefin multi-block copolymers
- OBC olefin block copolymer
- m-LLDPE substantially linear, or linear,
- polyethylene may be produced in gas-phase, fluidized bed reactors, liquid phase slurry process reactors, or liquid phase solution process reactors, using a heterogeneous catalyst system, such as Ziegler-Natta catalyst, a homogeneous catalyst system, comprising Group 4 transition metals and ligand structures such as metallocene, non-metallocene metal-centered, heteroaryl, heterovalent aryloxyether, phosphinimine, and others.
- a heterogeneous catalyst system such as Ziegler-Natta catalyst
- a homogeneous catalyst system comprising Group 4 transition metals and ligand structures such as metallocene, non-metallocene metal-centered, heteroaryl, heterovalent aryloxyether, phosphinimine, and others.
- a heterogeneous catalyst system such as Ziegler-Natta catalyst
- a homogeneous catalyst system comprising Group 4 transition metals and ligand structures such as metallocene, non-metallocene metal-centered,
- ethylene-based polyolefin material is a material that contains more than 50 weight percent of an ethylene-based polymer (based on the total weight of the material) .
- Ethylene-based polyolefin materials include pure polyethylene as well as blends of ethylene-based polymers with other polyolefin polymers.
- optical fiber is a flexible, transparent fiber made by drawing glass or plastic to a diameter of several hundred microns or less. Typical optical fiber has a diameter from 230 micrometers ( ⁇ m) to 270 ⁇ m, or 250 ⁇ m. The diameter of the optical fiber may or may not include a cladding and/or a coating surrounding the optical fiber. Optical fiber is used most often as a way to transmit light between the two ends of the fiber. Optical fiber finds wide usage in fiber-optic communications, where it enables transmission over distances and at data rates greater than wire cables.
- a “propylene-based polymer” is a polymer that contains more than 50 weight percent polymerized propylene monomer (based on the total amount of polymerizable monomers) and, optionally, may contain at least one comonomer.
- Propylene-based polymer includes propylene homopolymer and propylene copolymer (meaning units derived from propylene and one or more comonomers) .
- the terms “propylene-based polymer” and “polypropylene” may be used interchangeably.
- a “propylene-based polyolefin material” is a material that contains more than 50 weight percent of a propylene-based polymer (based on the total weight of the material) .
- Ethylene-based polyolefin materials include pure polypropylene as well as blends of propylene-based polymers with other polyolefin polymers.
- Interpolymer refers to polymers prepared by the polymerization of at least two different types of monomers.
- the generic term interpolymer thus includes copolymers (employed to refer to polymers prepared from two different types of monomers) , and polymers prepared from more than two different types of monomers.
- Melt flow rate is measured in accordance with ASTM D1238, Condition 230°C/2.16 kilogram (kg) weight and reported in grams per 10 minutes (g/10 min) .
- MI Melt index
- T m Melt temperature, or “T m ” as used herein (also referred to as a melting peak in reference to the shape of the plotted DSC curve) is typically measured by the DSC (Differential Scanning Calorimetry) technique for measuring the melting points or peaks of polyolefins, as described in USP 5, 783, 638. It should be noted that many blends comprising two or more polyolefins will have more than one melting point or peak, many individual polyolefins will comprise only one melting point or peak.
- Molecular weight is determined using gel permeation chromatography (GPC) on a Waters 150°C high temperature chromatographic unit equipped with three mixed porosity columns (Polymer Laboratories 103, 104, 105, and 106) , operating at a system temperature of 140°C.
- the solvent is 1, 2, 4-trichlorobenzene, from which 0.3 percent by weight solutions of the samples are prepared for injection.
- the flow rate is 1.0 mL/min and the injection size is 100 microliters.
- the molecular weight determination is deduced by using narrow molecular weight distribution polystyrene standards (from Polymer Laboratories) in conjunction with their elution volumes.
- the equivalent polyethylene molecular weights are determined by using appropriate Mark-Houwink coefficients for polyethylene and polystyrene (as described by T. Williams &I. M. Ward, The Construction of a Polyethylene Calibration Curve for Gel Permeation Chromatography Using Polystyrene Fractions, 6 J. Polymer Sci. Pt. B: Polymer Letter 621, 621–624 (1968) ) to derive the following equation:
- M polyethylene a ⁇ (M polystyrene ) b
- Number average molecular weight, M n of a polymer is expressed as the first moment of a plot of the number of molecules in each molecular weight range against the molecular weight. In effect, this is the total molecular weight of all molecules divided by the number of molecules and is calculated in the usual matter according to the following formula:
- n i number of molecules with molecular weight M i
- w i weight fraction of material having molecular weight M i
- Oil adsorption is determined by injecting the polymeric material into a dumbbell shape having a weight of approximately 1.2 grams. The dumbbell-shaped samples are carefully weighed, immersed in a prepared fluid and stored (immersed in the fluid) at 80°C for 5 days. After heat storage, the samples are cleaned by paper or cloth and weight carefully. The result of the weight after storage minus the weight before storage is the oil weight absorbed by the dumbbell-shaped samples. 6 replicate samples are tested for each fluid sample. Results are reported in percent.
- Polymer refers to a polymeric compound prepared by polymerizing monomers, whether of the same or a different type.
- the generic term polymer thus embraces the term homopolymer (employed to refer to polymers prepared from only one type of monomer, with the understanding that trace amounts of impurities can be incorporated into the polymer structure) , and the term interpolymer as previously defined. Trace amounts of impurities, for example, catalyst residues, may be incorporated into and/or within the polymer.
- Olefin polymer "olefinic polymer, “ “olefinic interpolymer, “ “polyolefin” and like terms refer to a polymer derived from simple olefins.
- Representative polyolefins include polyethylene, polypropylene, polybutene, polyisoprene and their various interpolymers.
- the shear rate is the rate of change of velocity at which one layer of a fluid passes over an adjacent layer.
- Shear rate is a gradient velocity and depends on flow velocity and radius of the tube/vessel.
- the shear rate is calculated by wherein is the shear rate, measured in reciprocal seconds, v is the velocity of the moving plate, measured in meters per second (m/sec) , and h is the distance between the two parallel plates, measured in meters (m) .
- Shear rate is reported in inverse seconds (s -1 ) .
- the shear thinning index is the ratio of shear viscosities at a low shear rate (e.g., 0.1 s -1 to 10 s -1 ) and a high shear rate (e.g., greater than or equal to 100 sec -1 ) .
- the shear thinning index is measured in a steady state shear mode by a rotational rheometer AR2000EX, TA instruments with a 20 mm, 2 degree steel cone plate.
- the testing temperature is set at 25°Cand the shear rates ranged from 1 s -1 to 201 s -1 .
- the shear thinning index is calculated using the shear viscosity at 6 s -1 and the shear viscosity at 201 s -1 .
- the tensile stress at yield (zero slope) , automatic Young’s modulus and 1%secant modulus are determined in accordance with ASTM D638 and reported in megapascal (MPa) .
- Shear viscosity (or dynamic viscosity) is a fluid’s resistance to shearing flows and is reported in Pa ⁇ s (pascal seconds) , mPa ⁇ s (millipascal seconds) or MPa ⁇ s (megapascal seconds) . Shear viscosity is calculated by wherein ⁇ is the shear viscosity measured in Pascal ⁇ seconds, ⁇ is the shear stress measured in Pascal, and is the shear rate, measured in reciprocal seconds. For purposes of this specification, shear viscosity is measured using an AR2000EX rotational rheometer, TA instruments with a 20mm, 2degrees steel cone plate. The testing temperature is set at 25°C and the shear rates ranged from 1 s -1 to 201 s -1 .
- Low shear rate viscosity is the shear viscosity measured at a shear rate of 6 s -1 .
- Medium shear rate viscosity is the shear viscosity measured at a shear rate of 51 s -1 .
- High shear rate viscosity means the shear viscosity measured at a shear rate of 201 s -1 .
- Kinematic viscosity is the ratio of the shear viscosity to the density of a fluid and is reported in St (stokes) or cSt (centistokes) .
- St stokes
- cSt centistokes
- kinematic viscosity is measured at 40°C using a Brookfield viscometer in accordance with ASTM D 445.
- the present disclosure provides a filling composition
- a filling composition comprising (A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40°C; (B) a styrene-ethylene/propylene diblock copolymer; and (C) a propylene/ethylene copolymer having a weight average molecular weight (M w ) from 5,000 to 200,000.
- the disclosure provides a filling composition
- a filling composition comprising (A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40°C; (B) a styrene-ethylene/propylene diblock copolymer; and (C) an ethylene/propylene copolymer having a weight average molecular weight (M w ) from 5,000 to 200,000.
- the filling composition comprises a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt.
- the mineral oil is free of fillers and rheology modifiers, such as thickeners.
- the mineral oil is present in the composition in an amount of from 70 weight percent (wt%) , or 75 wt%, or 80 wt%to 85 wt%, or 87 wt%, or 88 wt%, or 89 wt%, or 90 wt%based on the total weight of the filling composition.
- the filling composition comprises a styrene-ethylene/propylene diblock copolymer.
- the styrene-ethylene/propylene diblock copolymer has a bound styrene content from 25%, or 30%, or 35%to 40%, or 45%by mass.
- the styrene-ethylene/propylene diblock copolymer has a density from 0.890 g/cc, or 0.895 g/cc, or 0.900 g/cc, or 0.905 g/cc to 0.910 g/cc, or 0.915 g/cc, or 0.920 g/cc.
- the styrene-ethylene/propylene diblock copolymer is present in the filling composition to the exclusion of triblock polymers and styrenic tribock polymers in particular.
- a non-limiting example of a suitable commercially-available styrene-ethylene/propylene diblock copolymer is G1701, a clear linear diblock copolymer based on styrene and ethylene/propylene, with a bound styrene content of 35%mass, available from Kraton Company.
- the styrene-ethylene/propylene diblock copolymer is a mixture of two or more styrene-ethylene/propylene diblock copolymers as described herein.
- the styrene-ethylene/propylene diblock copolymer or mixture of two or more styrene-ethylene/propylene diblock copolymers is present in the composition in an amount of from 5 wt%, or 6 wt%, or 7 wt%, or 8 wt%, or 9 wt%to 10 wt%, or 11 wt%, or 12 wt%, or 13 wt%, or 14 wt%or 15 wt%based on the total weight of the filling composition.
- the filing composition comprises a propylene/ethylene copolymer.
- the propylene/ethylene copolymer has a weight average molecular weight (M w ) from 5,000, or 10,000, or 20,000 to 50,000, or 100,000, or 150,000, or 200,000.
- the propylene/ethylene copolymer has a number average molecular weight (M n ) from 5,000, or 10,000, or 20,000, or 50,000 to 60,000, or 75,000, or 100,000.
- the propylene/ethylene copolymer has a density from 0.850 g/cc, or 0.855 g/cc, or 0.860 g/cc, or 0.965 g/cc to 0.870 g/cc, or 0.875 g/cc, or 0.880 g/cc, or 0.885 g/cc, or 0.890 g/cc, or 0.895 g/cc, or 0.900 g/cc.
- the propylene/ethylene copolymer has an ethylene content from 1 wt%, or 2 wt%, or 3 wt%, or 4 wt%, or 5 wt%to 6 wt%, or 7 wt%, or 8 wt%, or 9 wt%, or 10 wt%, based on the total weight of the propylene/ethylene copolymer.
- the propylene/ethylene copolymer has a melt flow rate (MFR) from 5 g/10 min, or 10 g/10 min, or 25 g/10 min, or 50 g/10 min, or 100 g/10 min to 250 g/10 min, or 500 g/10 min, or 750 g/10 min, or 1000 g/10 min.
- MFR melt flow rate
- the propylene/ethylene copolymer has a melt temperature (T m ) from 120°C, or 130°C, or 140°C to 150°C, or 160°C, or 170°C.
- the propylene/ethylene copolymer has one, some or all of the following properties:
- an ethylene content from 4 wt%, or 4.25 wt%, or 4.5 wt%, or 4.75 wt%, or 5 wt%, or 5.25 wt%, or 5.5 wt%, or 5.75 wt%to 6 wt%, or 6.25 wt%, or 6.5 wt%, or 6.75 wt%, or 7 wt%, or 7.25 wt%, or 7.5 wt%, or 7.75 wt%, or 8 wt%, based on the total weight of the propylene/ethylene copolymer; and/or
- a MFR from 20 g/10 min, or 22 g/10 min, or 24 g/10 min, or 25 g/10 min to 27 g/10 min, or 29 g/10 min, or 30 g/10 min, or 32 g/10 min;
- M w weight average molecular weight from 25,000, or 30,000, or 35,000, or 40,000, or 45,000, or 50,000, or 55,000, or 60,000, or 65,000, to 70,000, or 75,000, or 80,000, or 100,000, or 125,000, or 150,000, or 175,000; and/or
- T m a melt temperature from 130°C, or 135°C, or 140°C, or 145°C to 150°C, or 155°C, or 160°C, or 165°C.
- VERSIFY 4301 available from the Dow Chemical Company.
- the propylene/ethylene copolymer is a mixture of two or more propylene/ethylene copolymers as described herein.
- the propylene/ethylene copolymer or mixture of two or more propylene/ethylene copolymers is present in the composition in an amount of from 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%to 7 wt%, or 8 wt%, or 10 wt%, or 15 wt%, or 20 wt%based on the total weight of the filing composition.
- the filling composition comprises an ethylene/propylene copolymer.
- the ethylene/propylene copolymer has a weight average molecular weight (M w ) from 5,000, or 10,000, or 20,000 to 30,000, or 50,000, or 100,000, or 200,000.
- the ethylene/propylene copolymer has a number average molecular weight (M n ) from 5,000, or 10,000, or 20,000, or 50,000 to 60,000, or 75,000, or 100,000.
- the ethylene/propylene copolymer has a density from 0.850 g/cc, or 0.855 g/cc, or 0.860 g/cc, or 0.965 g/cc to 0.870 g/cc, or 0.875 g/cc, or 0.880 g/cc, or 0.885 g/cc, or 0.890 g/cc, or 0.895 g/cc, or 0.900 g/cc.
- the ethylene/propylene copolymer has a melt index (MI) from 600 g/10 min, or 650 g/10 min, or 700 g/10 min to 750 g/10 min, or 800 g/10 min at 190°C, 2.16 kg.
- MI melt index
- the ethylene/propylene copolymer has a propylene content from 5 wt%, or 10 wt%, or 15 wt%to 20 wt%, or 25 wt%, or 30 wt%based on the total weight of the ethylene/propylene copolymer.
- the ethylene/propylene copolymer has a melt index (MI) from 600 g/10 min, or 650 g/10 min, or 700 g/10 min to 750 g/10 min, or 800 g/10 min.
- MI melt index
- the ethylene/propylene copolymer has a melt temperature (T m ) from 50°C, or 55°C, or 60°C, or 65°C, or 70°C, or 75°C to 80°C, or 85°C, or 90°C, or 95°C, or 100°C, or 105°C, or 110°C.
- T m melt temperature
- the ethylene/propylene copolymer has one, some or all of the following properties:
- a propylene content from 15 wt%, or 16 wt%, or 17 wt%, or 18 wt%, or 19 wt%, or 20 wt%to 21 wt%, or 22 wt%, or 23 wt%, or 24 wt%, or 25 wt%; and/or
- a MI from 650 g/10 min, or 675 g/10 min, or 700 g/10 min to 725 g/10 min, or 750 g/10 min, or 775 g/10 min, or 800 g/10 min;
- M w weight average molecular weight
- T m a melt temperature from 55°C, or 60°C, or 65°C to 70°C, or 75°C, or 80°C, or 85°C.
- a non-limiting example of a suitable ethylene/propylene copolymer is an ethylene-propylene copolymer having a MI of 700 g/10 min, a viscosity at 177°C of 12, 500 mPa, a density of 0.890 g/cc, a propylene content of 20%by weight, a M n of 8,000 and a M w of 18,000.
- the ethylene/propylene copolymer is a mixture of two or more ethylene/propylene copolymers as described herein.
- the ethylene/propylene copolymer or mixture of two or more ethylene/propylene copolymers is present in the filling composition in an amount of from 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%to 7 wt%, or 8 wt%, or 10 wt%, or 15 wt%, or 20 wt%based on the total weight of the filling composition.
- the filing composition optionally includes an antioxidant.
- Antioxidant refers to types or classes of chemical compounds that are capable of being used to minimize the oxidation that can occur during the processing of polymers. Suitable antioxidants include high molecular weight hindered phenols and multifunctional phenols such as sulfur and phosphorous-containing phenol.
- Representative hindered phenols include; 1, 3, 5-trimethyl-2, 4, 6-tris- (3, 5-di-tert-butyl-4-hydroxybenzyl) -benzene; pentaerythrityl tetrakis-3 (3, 5-di-tert-butyl-4-hydroxyphenyl) -propionate; n-octadecyl-3 (3, 5-di-tert-butyl-4-hydroxyphenyl) -propionate; 4, 4'-methylenebis (2, 6-tert-butyl-phenol) ; 4, 4'-thiobis (6-tert-butyl-o-cresol) ; 2, 6-di-tertbutylphenol; 6- (4-hydroxyphenoxy) -2, 4-bis (n-octyl-thio) -l, 3, 5 triazine; di-n-octylthio) ethyl 3, 5-di-tert-butyl-4-hydroxy-benzoate; and sorbi
- a non-limiting example of a suitable antioxidant is tris (2, 4-ditert-butylphenyl) phosphite, available as 168 from Ciba.
- the antioxidant is present in an amount can from 0 wt%, or greater than 0 wt%, or 0.01 wt%, or 0.02 wt%, or 0.03 wt%, or 0.04 wt%, or 0.05 wt%, or 0.06 wt%, or 0.07 wt%, or 0.08 wt%, or 0.09 wt%, or 0.1 wt%to 0.12 wt%, or 0.14 wt%, or 0.16 wt%, or 0.18 wt%, or 0.2 wt%, or 0.25 wt%, or 0.3 wt%, or 0.5 wt%, or 1 wt%, or 2 wt%, based on the total weight of the filing composition.
- the disclosure provides a filling composition
- a filling composition comprising (A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40°C; (B) a styrene-ethylene/propylene diblock copolymer; (C) a propylene/ethylene copolymer having a weight average molecular weight (M w ) from 5,000 to 200,000, and, optionally, (D) an antioxidant (hereafter “Filling Composition 1” ) .
- the disclosure provides a filling composition
- a filling composition comprising (A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40°; (B) a styrene-ethylene/propylene diblock copolymer; and (C) an ethylene/propylene copolymer having a weight average molecular weight (M w ) from 5,000 to 200,000, and, optionally, (D) an antioxidant (hereafter “Filling Composition 2” ) .
- Filling Composition 1 and Filling Composition 2 have a drop point from 150°C, or 180°C, or 190°C, or 195°C, or 200°C, or 220°C to 225°C, or 250°C, or 275°C, or 300°C.
- Filling Composition 1 and Filling Composition 2 have a low shear rate viscosity from greater than 50 Pa ⁇ s, or 55 Pa ⁇ s, or 60 Pa ⁇ s, or 70 Pa ⁇ s, or 75 Pa ⁇ s, or 80 Pa ⁇ sto 90 Pa ⁇ s, or 100 Pa ⁇ s, or 110 Pa ⁇ s, or 120 Pa ⁇ s, or 130 Pa ⁇ s, or 140 Pa ⁇ s, or 150 Pa ⁇ s.
- Filling Composition 1 and Filling Composition 2 have a medium shear rate viscosity from 10 Pa ⁇ s, or 12 Pa ⁇ s, or 15 Pa ⁇ sto 18 Pa ⁇ s, or 20 Pa ⁇ s, or 25 Pa ⁇ s, or 30 Pa ⁇ s, or 35 Pa ⁇ s, or 40 Pa ⁇ s.
- Filling Composition 1 and Filling Composition 2 have a high shear rate viscosity from greater than 0 Pa ⁇ s, or 0.05 Pa ⁇ s, or 0.1 Pa ⁇ s, or 0.15 Pa ⁇ s, or 0.2 Pa ⁇ s, or 0.25 Pa ⁇ sto 0.3 Pa ⁇ s, or 0.35 Pa ⁇ s, or 0.4 Pa ⁇ s, or 0.5 Pa ⁇ s, or 1.0 Pa ⁇ s, or 5 Pa ⁇ s, or 10 Pa ⁇ sor 15 Pa ⁇ s, or 20 Pa ⁇ s.
- Filling Composition 1 and Filling Composition 2 have a shear thinning index from 8, or 10, or 20, or 50, or 100, or 150 to 200, or 300, or 400, or 500, or 1000, or 2000, or 3000, or 5000.
- Filling Composition 1 and Filling Composition 2 hear a low shear rate viscosity from greater than 50 Pa ⁇ s, or 55 Pa ⁇ s, or 60 Pa ⁇ s, or 70 Pa ⁇ s, or 75 Pa ⁇ s, or 80 Pa ⁇ sto 90 Pa ⁇ s, or 100 Pa ⁇ s, or 110 Pa ⁇ s, or 120 Pa ⁇ s, or 130 Pa ⁇ s, or 140 Pa ⁇ s, or 150 Pa ⁇ sand at least one of (i) a shear thinning index from 8, or 10, or 20, or 50, or 100, or 150 to 200, or 300, or 400, or 500, or 1000, or 2000, or 3000, or 5000 and (ii) a drop point from 150°C, or 180°C, or 190°C, or 195°C, or 200°C, or 220°C to 225°C, or 250°C, or 275°C, or 300°C.
- a shear thinning index from 8, or 10, or 20, or 50, or 100, or 150 to 200, or 300, or 400, or 500,
- Filling Composition 1 and Filling Composition 2 are homogenous blends.
- a homogenous blend is clear shows no separation and no undissolved particulate in the composition.
- Filling Composition 1 has one, some, or all of the properties:
- a drop point from 150°C, or 180°C, or 190°C, or 195°C, or 200°C, or 220°C to 225°C, or 250°C, or 275°C, or 300°C; and/or
- a low shear rate viscosity from 50 Pa ⁇ s, or 55 Pa ⁇ s, or 60 Pa ⁇ s, or 70 Pa ⁇ s, or 75 Pa ⁇ s, or 80 Pa ⁇ sto 90 Pa ⁇ s, or 100 Pa ⁇ s, or 110 Pa ⁇ s, or 120 Pa ⁇ s, or 130 Pa ⁇ s, or 140 Pa ⁇ s, or 150 Pa ⁇ s; and/or
- a medium shear rate viscosity from 10 Pa ⁇ s, or 12 Pa ⁇ s, or 15 Pa ⁇ sto 18 Pa ⁇ s, or 20 Pa ⁇ s, or 25 Pa ⁇ s, or 30 Pa ⁇ s, or 35 Pa ⁇ s, or 40 Pa ⁇ s; and/or
- a high shear rate viscosity from 0 Pa ⁇ s, or 0.05 Pa ⁇ s, or 0.1 Pa ⁇ s, or 0.15 Pa ⁇ s, or 0.2 Pa ⁇ s, or 0.25 Pa ⁇ sto 0.3 Pa ⁇ s, or 0.35 Pa ⁇ s, or 0.4 Pa ⁇ s, or 0.5 Pa ⁇ s, or 1.0 Pa ⁇ s, or 5 Pa ⁇ s, or 10 Pa ⁇ sor 15 Pa ⁇ s, or 20 Pa ⁇ s; and/or
- Filling Composition 1 has at least two, at least three, at least four, or all five of properties i) –v) . In an embodiment, Filling Composition 1 has at least property ii) and one other property selected from property i) and property v) . In an embodiment, Filling Composition 1 has at least each of properties i) , ii) and v) . In an embodiment, Filling Composition 1 is homogenous.
- Filling Composition 1 has one, some, or all of the properties:
- Filling Composition 1 has at least two, at least three, at least four, or all five of properties i) -v) . In an embodiment, Filling Composition 1 has property ii) and at least one other property selected from property i) and property v) . In an embodiment, Filling Composition 1 has at least each of properties i) , ii) and v) . In an embodiment, Filling Composition 1 is homogenous.
- the composition comprises (A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40°C; (B) a styrene-ethylene/propylene diblock copolymer; (C) a propylene/ethylene copolymer having a weight average molecular weight (M w ) from 5,000 to 200,000, and, optionally, (D) an antioxidant (Filling Composition 1) .
- Filling Composition 1 has one, some or all of the properties:
- Filling Composition 1 has at least two, at least three, at least four, or all five of properties i) -v) . In an embodiment, Filling Composition 1 has property (ii) and at least one other property selected from property i) and property v) . In an embodiment, Filling Composition 1 has at least each of properties i) , ii) and v) . In an embodiment, Filling Composition 1 is homogenous.
- FIGURE 1 provides a cross-sectional view of an exemplary buffer tube 10 which surrounds a plurality of optical fibers 15 and is filled with a filling composition 20.
- the filling composition 20 is in contact with a surface, specifically an inner surface 12, of the buffer tube 10.
- the filling composition 20, or simply composition is according to any one or combination of two or more embodiments provided herein.
- the buffer tube is composed of a polymeric material.
- suitable polymeric materials include olefin-based polymers, such as ethylene-based polymers and propylene-based polymers, polybutylene terephthalate, and combinations thereof.
- the buffer tube is composed of one or more olefin-based polymers to the exclusion of polybutylene terephthalate.
- the buffer tube material is a propylene-based polyolefin material.
- the propylene-based polyolefin material comprises from 50 wt%, or 55 wt%, or 60 wt%, or 65 wt%, or 70 wt%to 75 wt%, or 80 wt%, or 85 wt%, or 90 wt%, or 95 wt%, or 100 wt%of a propylene-based polymer.
- the propylene-based polymer may be blended with at least one other polyolefin.
- suitable polyolefins include other propylene-based polymers and ethylene-based polymers, including random propylene-and/or ethylene-based polymers and block copolymers.
- the buffer tube material is a blend comprising from greater than 50 wt%, or 55 wt%, or 60 wt%, or 65 wt%, or 70 wt%to 75 wt%, or 80 wt%, or 85 wt%, or 90 wt%, or 95 wt%of a propylene-based polymer and from 5 wt%, or 10 wt%, or 15 wt%, or 20 wt%, or 25 wt%, or 30 wt%to 35 wt%, or 40 wt%, or 45 wt%or less than 50 wt%of an ethylene-based polymer.
- the buffer tube material is an ethylene-based polyolefin material.
- the ethylene-based polyolefin material comprises from 50 wt%, or 55 wt%, or 60 wt%, or 65 wt%, or 70 wt%to 75 wt%, or 80 wt%, or 85 wt%, or 90 wt%, or 95 wt%, or 100 wt%of an ethylene-based polymer.
- the ethylene-based polymer may be blended with at least one other polyolefin.
- suitable polyolefins include other ethylene-based polymers and propylene-based polymers, including random ethylene-and/or propylene-based polymers and block copolymers.
- the buffer tube material is a blend comprising from greater than 50 wt%, or 55 wt%, or 60 wt%, or 65 wt%, or 70 wt%to 75 wt%, or 80 wt%, or 85 wt%, or 90 wt%, or 95 wt%of an ethylene-based polymer and from 5 wt%, or 10 wt%, or 15 wt%, or 20 wt%, or 25 wt%, or 30 wt%to 35 wt%, or 40 wt%, or 45 wt%or less than 50 wt%of a propylene-based polymer.
- the buffer tube material is a block composite composed of (i) propylene homopolymer, (ii) an ethylene/propylene copolymer, and (iii) a block copolymer having a propylene block (PB) and an ethylene block (EB) wherein the propylene block (PB) is the same propylene homopolymer as component (i) of the block composite and the ethylene block (EB) is the same ethylene/propylene copolymer as component (ii) of the block composite.
- PB propylene block
- EB ethylene block
- the buffer tube comprises a filling composition in contact with a surface of the buffer tube, the filling composition comprising (A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40°C; (B) a styrene-ethylene/propylene diblock copolymer; (C) a propylene/ethylene copolymer having a weight average molecular weight (M w ) from 5,000 to 200,000, and, optionally (D) an antioxidant (Filling Composition 1) , and the buffer tube is composed of a polyolefin material and has one, some or all of the properties:
- a tensile stress at yield (zero slope) from 27, or 28 to 29, or 30, or 31, or 32;
- a modulus (automatic Young’s ) from 600 MPa, or 700 MPa, or 800 MPa to 850 MPa, or 875 MPa, or 890 mPa, or 900 MPa, or 925 MPa, or 950 MPa, or 975 MPa, or 1,000 MPa, or, 1, 300 MPa, or 1, 500 MPa; and/or
- the buffer tube has at least two, at least three, or all four of the properties i) -iv) .
- the buffer tube is composed of a block composite and comprises a filling composition in contact with a surface of the buffer tube, the composition comprising A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40°C; (B) a styrene-ethylene/propylene diblock copolymer; (C) a propylene/ethylene copolymer having a weight average molecular weight (M w ) from 5,000 to 200,000, and, optionally, (D) an antioxidant (Filling Composition 1) and the buffer tube has one, some, or all of the properties:
- the buffer tube has two, three, or all four properties i) -iv) .
- the buffer tube is composed of block composite and comprises a filling composition in contact with a surface of the buffer tube, the filling composition comprising A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40°C; (B) a styrene-ethylene/propylene diblock copolymer; (C) a propylene/ethylene copolymer having a weight average molecular weight (M w ) from 5,000 to 200,000, and, optionally, (D) an antioxidant (Filling Composition 1) and the Filling Composition 1 has one, some, or all of the properties:
- a high shear rate viscosity (201 5 -1 ) from greater than 0 Pa ⁇ sto 10 Pa ⁇ s;
- v a shear thinning index from 150 to 3000, wherein the buffer tube has one, some, or all of the properties:
- a modulus (automatic Young’s ) from 800 MPa to 1, 500 MPa;
- the composition has two, three, four or all five properties i) -v) and the buffer tube has two, three, or all four properties vi) -ix) .
- Filling Composition 1 has property ii) and at least one other property selected from property i) and property v) .
- Filling Composition 1 has at least each of properties i) , ii) and v) .
- Filling Composition 1 is homogenous.
- An optical fiber cable includes one or more optical fibers or other optical waveguides that conduct optical signals (e.g., for carrying sound, data, video or other information) .
- the optical fibers are arranged in a buffer tube as described herein.
- FIGURE 1 is a cross-sectional view of an exemplary optical fiber cable 100.
- FIGURE 1 shows a plurality of buffer tubes 10 each surrounding a plurality of optical fibers 15 and including a filling composition 20.
- the buffer tubes 10 are arranged around a central strength member 30 and the buffer tubes 10 and strength member 30 are encased by a water blocking tape 40 and cable jacket 50 to form the optical fiber cable 100.
- the tubular structure formed by the water blocking tape 40 and cable jacket 50 is filled with filling composition 20 to provide protection against moisture and mechanical stress.
- an optical fiber cable includes one or more buffer tubes as described herein.
- 15#Mineral Oil is a mineral oil having a kinematic viscosity of 15 cSt at 40°C (available from Sinoreagent Company) .
- Mineral Oil is a mineral oil having a kinematic viscosity of 80 cSt at 40°C (available from Suzhou Saipahan Oil Company) .
- #100 Mineral Oil is a mineral oil having a kinematic viscosity of 100 cSt at 40°C (available from Sinoreagent Company) .
- #200 Mineral Oil is a mineral oil having a kinematic viscosity of 200 cSt at 40°C (available from Shanghai Chaoya Oil Company) .
- G1701 is a clear linear diblock copolymer based on styrene and ethylene/propylene (S-E/P) with a bound styrene content of 35%by mass, available from Kraton Company.
- PIB is poly (iso-butylene) available from INEOS as Durasyn 166.
- P/E1 is a propylene/ethylene copolymer having a density of 0.885 g/cc, an ethylene content of 6 wt%, a M w of 26, 914 and a M n of 11, 815.
- P/E2 is a propylene/ethylene copolymer having a density of 0.866 g/cc, a M w of 152, 900 and a M n of 64, 730, available as VERSIFY 4301 from Dow Chemical Company.
- P/E3 is a propylene/ethylene copolymer having a density of 0.863 g/cc, a M w of 275, 100 and a M n of 107, 500, available as VERSIFY 2400 from Dow Chemical Company.
- E/P is an ethylene/propylene copolymer having a density of 0.890 g/cc, a melt index of 700 g/10 min, a viscosity @177°C of 12, 500 mPa ⁇ s, a propylene content of 20 wt%, a M w of 18,000 and a M n of 8,000.
- the material used to make the buffer tube is a block composite composed of (i) a propylene homopolymer, (ii) an ethylene/propylene copolymer, and (iii) a block copolymer having a propylene block (PB) and an ethylene block (EB) wherein the propylene block is the same propylene homopolymer as component (i) of the block composite and the ethylene block (EB) is the same ethylene/propylene copolymer of component (ii) of the block composite.
- PB propylene block
- EB ethylene block
- the block composite comprises approximately 60 wt%of (i) the propylene homopolymer, from 30 wt%to 35 wt%of (ii) the ethylene/propylene copolymer, and from 5 wt%to 10 wt%of the block composite, based on the total weight of the blend.
- compositions of (A) mineral oil, (B) G1701, and (C) P/E1, P/E2, P/E3 or E/P are formed by putting the components (A) - (C) , in accordance with the amounts provided in Table 1, into a Parr Reactor steel vessel.
- the vessel is installed in Parr Reactor while water pipe and pressure release valves are shut off.
- the mixer is started at 100-200 rpm while the heater begins to heat the vessel from room temperature to 180°C.
- the mixer is set to maximum speed (800 rpm) when the temperature reaches 180°C. After 2 hours of mixing at maximum speed, the heater is shut off.
- the vessel is released when the temperature hits 100°C.
- the fluid is transferred from the steel vessel to a glass bottle for performance evaluation.
- ** CS0 tests the material with no exposure to a filling composition
- CS1, CS2 and IE1-IE5 show no separation and the mixture appeared homogenous to the unaided eye.
- CS3 uses a mineral oil having a kinematic viscosity of 200 cSt (greater than 80 cSt to 100 cSt) .
- CS4 uses a propylene/ethylene copolymer with a M w of 275, 100 (greater than 200,000) . Both CS3 and CS4 are inhomogeneous with visible separation and/or particulate in the fluid. CS3 and CS4 are not tested because the propylene/ethylene copolymer cannot dissolve into the oil and the properties of the filling compositions of CS3 and CS4 therefore cannot be determined.
- the CS0 is a comparative sample which shows the mechanical properties of the buffer tube material without exposure to any filling composition. While the mechanical properties of the buffer tube material generally worsened upon absorption of the oil from the filling compositions of CS1-CS2 and IE1-IE5, the mechanical properties of the buffer tubes of IE1-IE5, which each use a filling composition of the present disclosure, each have improved mechanical properties compared to CS1 and CS2.
- CS1 to CS2 and IE1-IE5 show that using a mineral oil with a viscosity less than 80 cSt results in increased oil adsorption by the buffer tube material (2. 9.42%for CS1 compared to 96-4.42%for CS2 and IE1-IE5) .
- CS2 and IE1-IE5 show significantly improved mechanical properties after exposure to the oil.
- CS2 and IE1-IE5 each has an automatic Yong’s modulus of 600 MPa to 1, 500 MPa (compared to CS1 having an automatic Young’s modulus of 1612 MPa) and a 1%secant modulus from 500 MPa to 1,000 MPa (compared to CS1 having a 1%secant modulus of 1, 249 MPa) , while maintaining a tensile stress at yield from 27-32 MPa.
- CS2 which uses a mineral oil having a viscosity of 15 cSt (less than 80 cSt) does not having the combination of improved shear thinning performance (i.e., shear thinning index from 8 to 3,000) and improved low shear rate viscosity (i.e., low shear rate viscosity from 50 Pa ⁇ sto 150 Pa ⁇ s) .
- improved shear thinning performance i.e., shear thinning index from 8 to 3,000
- improved low shear rate viscosity i.e., low shear rate viscosity from 50 Pa ⁇ sto 150 Pa ⁇ s
- a comparison of CS2 to IE1-IE5 shows that that using a mineral oil with a viscosity of 80 cSt to 100 cSt in combination with an propylene/ethylene copolymer or ethylene/propylene copolymer having a M w of 5,000 to 200,000 results in a fluid having the combination of improved shear thinning performance (i.e., shear thinning index from 8 to 3,000) and improved low shear rate viscosity (i.e., low shear rate viscosity from 50 Pa ⁇ sto 150 Pa ⁇ s) .
- improved shear thinning performance i.e., shear thinning index from 8 to 3,000
- improved low shear rate viscosity i.e., low shear rate viscosity from 50 Pa ⁇ sto 150 Pa ⁇ s
- E1-IE5 each has a shear thinning index from 8 to 3000 and a low shear rate viscosity from 50 Pa ⁇ sto 150 Pa ⁇ s, while CS2 has a shear thinning index of 55.9 but a low shear rate viscosity of only 21.0 Pa ⁇ s.
- a higher low shear rate viscosity indicates the composition is more fluid (i.e., flows more readily when not under shear forces) and can be pumped.
- compositions containing a mineral oil with a viscosity less than 80 cSt, a styrene-ethylene/propylene diblock copolymer and an propylene/ethylene copolymer or ethylene/propylene copolymer having a Mw of 5,000 to 200,000 have higher (better) drop points (from 150°C to 300°C) in combination with low shear rate viscosity from 50 Pa ⁇ sto 150 Pa ⁇ s.
- CS2 has a drop point of 218.1°C
- CS2 has a low shear rate viscosity of only 21.0 Pa ⁇ s.
- CS2 with a drop point of 218.1°Cand a low shear rate viscosity of 21.0 Pa ⁇ s, does not have the combination of drop point and low shear rate viscosity performance, i.e., a drop point from 150°C to 300°C and a low shear rate viscosity from 50 Pa ⁇ sto 150 Pa ⁇ s.
- the inventive examples IE1-IE5 had better performance with respect to solubility of the styrene-ethylene/propylene diblock copolymer, oil adsorption, mechanical properties, shear thinning and drop point.
Abstract
Description
Claims (15)
- A filling composition comprising:(A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40℃;(B) a styrene-ethylene/propylene diblock copolymer; and(C) a propylene/ethylene copolymer having a weight average molecular weight (Mw) from 5000 to 200,000.
- The filling composition of claim 1 comprising:(A) from 70 wt%to 90 wt%of the mineral oil;(B) from 5 wt%to 15 wt%of the styrene-ethylene/propylene diblock copolymer; and(C) from 1 wt%to 20 wt%of the propylene/ethylene copolymer average.
- The filling composition of any of claims 1 or 2, wherein the propylene/ethylene copolymer has a weight average molecular weight (Mw) from 10,000 to 50,000.
- The filling composition of claim 3 having a drop point from 200℃ to 300℃.
- The filling composition of claim 4 having a shear viscosity at 6 s-1 from 50 Pa·sto 150 Pa·s.
- The filling composition of claim 5 having a shear thinning index from 8 to 3000.
- A filling composition comprising:(A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40℃;(B) a styrene-ethylene/propylene diblock copolymer; and(C) an ethylene/propylene copolymer having a weight average molecular weight (Mw) from 5000 to 200,000.
- The filling composition of claim 7 comprising:(A) 70 wt%to 90 wt%of the mineral oil;(B) 5 wt%to 15 wt%of the styrene-ethylene/propylene diblock copolymer; and(C) 1 wt%to 20 wt%of the ethylene/propylene copolymer.
- The filling composition of any of claims 4 and 5, wherein the ethylene/propylene copolymer has a weight average molecular weight of 10,000 to 30,000.
- A buffer tube comprising:a filling composition in contact with a surface of the buffer tube, the filling composition comprising:(A) a mineral oil having a kinematic viscosity from 80 cSt to 100 cSt at 40℃;(B) a styrene-ethylene/propylene diblock copolymer; and(C) a propylene/ethylene copolymer having a weight average molecular weight (Mw) from 5000 to 200,000.
- The buffer tube of claim 10, wherein the buffer tube comprises propylene-based polyolefin material.
- The buffer tube of any of claims 10 and 11, wherein the buffer tube has an oil absorption value from greater than 0%to 4.4%.
- The buffer tube of claim 12 having a 1%secant modulus from 700 MPa to 1,000 MPa.
- The buffer tube of claim 13 having an automatic Young’s modulus from 800 MPa to 1,500 MPa.
- The buffer tube of claim 14 having a tensile stress at yield from 27 to 31 MPa.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
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MX2019015419A MX2019015419A (en) | 2017-06-30 | 2017-06-30 | Filling composition for optical fiber cables. |
JP2019570021A JP7106582B2 (en) | 2017-06-30 | 2017-06-30 | Filling composition for fiber optic cables |
BR112019026934-7A BR112019026934A2 (en) | 2017-06-30 | 2017-06-30 | filling composition and damping tube |
CA3068850A CA3068850A1 (en) | 2017-06-30 | 2017-06-30 | Filling composition for optical fiber cables |
US16/624,556 US11466155B2 (en) | 2017-06-30 | 2017-06-30 | Filling composition for optical fiber cables |
EP17916135.1A EP3646097A4 (en) | 2017-06-30 | 2017-06-30 | Filling composition for optical fiber cables |
CN201780092349.4A CN110770620B (en) | 2017-06-30 | 2017-06-30 | Filling composition for optical fiber cable |
KR1020207001525A KR102384619B1 (en) | 2017-06-30 | 2017-06-30 | Filling composition for fiber optic cables |
PCT/CN2017/090993 WO2019000360A1 (en) | 2017-06-30 | 2017-06-30 | Filling composition for optical fiber cables |
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PCT/CN2017/090993 WO2019000360A1 (en) | 2017-06-30 | 2017-06-30 | Filling composition for optical fiber cables |
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WO2019000360A1 true WO2019000360A1 (en) | 2019-01-03 |
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EP (1) | EP3646097A4 (en) |
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JP2020530910A (en) | 2020-10-29 |
CN110770620A (en) | 2020-02-07 |
BR112019026934A2 (en) | 2020-07-07 |
CN110770620B (en) | 2022-10-18 |
EP3646097A4 (en) | 2021-01-27 |
MX2019015419A (en) | 2020-02-17 |
US20210155802A1 (en) | 2021-05-27 |
EP3646097A1 (en) | 2020-05-06 |
KR102384619B1 (en) | 2022-04-12 |
JP7106582B2 (en) | 2022-07-26 |
CA3068850A1 (en) | 2019-01-03 |
US11466155B2 (en) | 2022-10-11 |
KR20200023381A (en) | 2020-03-04 |
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